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[PATCH] Flag empty patches as errors

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A patch that contains no actual diff, and that doesn't change any
meta-data is bad. It shouldn't be a patch at all, and git-apply shouldn't
just accept it.

This caused a corrupted patch to be silently applied as an empty change in
the kernel, because the corruption ended up making the patch look empty.

An example of such a patch is one that contains the patch header, but
where the initial fragment header (the "@@ -nr,.." line) is missing,
causing us to not parse any fragments.

The real "patch" program will also flag such patches as bad, with the
message

	patch: **** Only garbage was found in the patch input.

and we should do likewise.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Linus Torvalds 2005-09-30 23:25:23 -07:00 committed by Junio C Hamano
parent 88cd621dee
commit 1fea629f79
1 changed files with 13 additions and 0 deletions
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13
apply.c
View file

@ -723,6 +723,16 @@ static int parse_single_patch(char *line, unsigned long size, struct patch *patc
return offset;
}
static inline int metadata_changes(struct patch *patch)
{
return patch->is_rename > 0 ||
patch->is_copy > 0 ||
patch->is_new > 0 ||
patch->is_delete ||
(patch->old_mode && patch->new_mode &&
patch->old_mode != patch->new_mode);
}
static int parse_chunk(char *buffer, unsigned long size, struct patch *patch)
{
int hdrsize, patchsize;
@ -733,6 +743,9 @@ static int parse_chunk(char *buffer, unsigned long size, struct patch *patch)
patchsize = parse_single_patch(buffer + offset + hdrsize, size - offset - hdrsize, patch);
if (!patchsize && !metadata_changes(patch))
die("patch with only garbage at line %d", linenr);
return offset + hdrsize + patchsize;
}